Network
In the context of a network, a hub is a node with a large degree, meaning it has connections with many other nodes.
see Brain network.
Neural circuitry refers to the interconnected network of neurons in the nervous system.
Zhao J. Network neurosurgery. Chin Neurosurg J. 2023 Feb 2;9(1):4. doi: 10.1186/s41016-023-00317-4. PMID: 36732790.